Agromyza polygoni Hering, 1941
Initially a narrow corridor, that widens into an elongated blotch. Frass at first very fine, later in coarse granules. Often the mines are conspicuously coloured violet red (Buhr, 1964a); they mainly occur in the lower leaves (Hering, 1941a).
Larvae in July (Hering, 1957a).
The pictures above show the first observation in the Benelux Benelux (cf. PESI, 2018).
distribution within Europe
From the Baltic States to France (cf. PESI, 2018).
The larvae are described by de Meijere, as Agromyza sp. (1937a: 174;1938a: 67). Anterior spiraculum with ± 10 papillae.
Beiger (1970a), Buhr (1964a), Černý & Merz (2005a, 2007a), Hering (1941a, 1957a), Huber (1969a), de Meijere (1937a, 1938a), Pakalniškis (1995a), Papp & Černý (2015a), Seidel (1957a), von Tschirnhaus (1999a), Winqvist, Černý & Andersen (2020a).